Full route posted this morning in the Des Moines Regiser
www dot desmoinesregister dot com/story/life/living-well/ragbrai/2022/03/27/ragbrai-2022-route-map-passthrough-towns-announced-miles-climb-iowa/9408408002/
Even the lightest skull cap still limits cooling to some extent IMO.
I’m going to try a couple of scalp / hair sunscreen sprays on training rides to see what works best for me.
Sun Bum and Banana Boat appears to be the two widely available options.